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Geniculate

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Geniculate antennae are sharply elbowed or bent.

Geniculate antennae are sharply elbowed or bent.

Wikimedia Commons user L. Shyamal, license cc-by-SA 2.5
Definition:

Geniculate is a term used to describe certain insect antennae. Geniculate antennae are bent or hinged sharply, almost like a knee or elbow joint. The term geniculate derives from the Latin genu, meaning knee.

Geniculate is a morphological form of antennae found in some groups of insects, especially in ants or bees.

Geniculate is just one of many morphological forms of insect antennae. See also:

Source: Borror and DeLong's Introduction to the Study of Insects, 7th Edition, by Charles A. Triplehorn and Norman F. Johnson

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